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Increased risk of maternal and neonatal complications in hormone replacement therapy cycles in frozen embryo transfer

Reproductive Biology and Endocrinology volume 18, Article number: 36 (2020) Cite this article

Abstract

Background

The endometrial preparation during frozen embryo transfer (FET) can be performed by natural cycle (NC), hormone replacement therapy (HRT) cycle and cycle with ovulation induction (OI). Whether different FET preparation protocols can affect maternal and neonatal outcomes is still inconclusive.

Methods

This was a retrospective cohort study that included 6886 women who delivered singleton live birth babies after 28 weeks of pregnancy underwent FET from January, 2015 to July, 2018. Women were divided into three groups according to the protocols used for endometrial preparation during FET: NC group (N = 4727), HRT group (N = 1642) and OI group (N = 517).

Results

After adjusting for the effect of age, body mass index (BMI), irregular menstruation, antral follicle count (AFC), endometrial thickness, the levels of testosterone, anti-Müllerian hormone (AMH), preconceptional fasting glucose (PFG), systolic and diastolic pressure et al., the HRT group had higher risk of hypertensive disorders of pregnancy (HDP) compared with the NC group (adjusted odds ratio (aOR) 2.00, 95% confidence interval (CI) 1.54–2.60). Singletons born after HRT FET were at increased risk of low birth weight (LBW) compared to NC group (aOR 1.49, 95%CI 1.09–2.06). The risks of preterm birth (PTB) in the HRT and OI group were elevated compared with the NC group (aOR 1.78, 95%CI 1.39–2.28 and aOR 1.51, 95%CI 1.02–2.23, respectively).

Conclusions

The HRT protocol for endometrial preparation during frozen embryo transfer of blastocysts was associated with increased risk of maternal and neonatal complications, compared to the NC and OI protocol.

Introduction

In 1984, the success of first live birth after thawing the frozen human embryos was reported by the team of Zeilmaker [1]. Since then, the proportion of frozen embryo transfer (FET) has been increasing in in-vitro fertilization (IVF) along with the development of laboratory techniques for cryopreservation and the reduced number of embryo transfer in fresh cycle [2]. Recently, the so called “freeze-all strategy”, i.e. selectively freezing all embryos and performing FET later has become an optimal choice in cycles with high risk of ovarian hyperstimulation syndrome (OHSS), preimplantation genetic testing (PGT) and double ovarian stimulation (DuoStim) protocols [3]. Several studies reported that FET achieved higher pregnancy rates and lower complications rates compared with fresh embryo transfer [4,5,6]. Therefore, the “freeze-all strategy” has been widely used to improve live birth rates and decrease potential complications.

Multiple protocols for endometrium preparation have been explored during FET. The common protocols include natural cycles (NC), artificial cycle with hormone replacement therapy (HRT), and cycle with ovulation induction (OI) [7, 8]. Groenewoud et al. conducted a randomized controlled trial (RCT) concluding that HRT cycle was not inferior to modified natural cycle for FET with regard to live birth rates (LBRs), clinical and ongoing pregnancy rates [9]. The latest Cochrane review suggested there were no significant differences in pregnancy rates, miscarriage rates, or live birth rates among different endometrial preparation protocols for FET [7]. However, the effect of different protocols on maternal and neonatal outcomes is still uncertain. Here, we performed a retrospective study to compare the maternal and neonatal outcomes in women underwent NC, HRT, or OI protocol for endometrial preparation.

Materials and methods

Study design and participants

The study included 6886 women aged 20–40, who received FET treatment after IVF/ intracytoplasmic sperm injection (ICSI) cycles in Center for Reproductive Medicine, Shandong University from January, 2015 to July, 2018 and delivered singleton live birth baby after 28 weeks of pregnancy. These women were divided into three groups according to the endometrial preparation protocols: NC group (n = 4727), HRT group (n = 1642) and OI group (n = 517). Women with type II diabetes mellitus or preconceptional fasting glucose (PFG) ≥7.0 mmol/L, preconceptional hypertension, polycystic ovary syndrome (PCOS), uterine malformation and intrauterine adhesion were excluded. PCOS was defined as menstrual abnormalities (irregular uterine bleeding, oligomenorrhea, or amenorrhea) combined with either hyperandrogenism or polycystic ovaries [10]. PGT and oocyte donation cycles were also excluded. All blastocysts were vitrified on day 5 or day 6 according to the embryo development. (Fig. 1, Additional file 1: Table S1).

Fig. 1
figure 1

Workflow of Study Enrollment

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Endometrial preparation protocols for FET

In general, NC protocol was the preferred choice for women with regular menstruation. For patients with irregular menstruation or history of oligo-ovulation or anovulation, HRT or OI protocol was used as first choice.

In the NC group, transvaginal ultrasound was starting since day 10–12 of the menstrual cycle depending on the diameter of the follicle till ovulation. Urinary luteinizing hormone (LH) was tested combined with the ultrasound examination when the dominant follicle reached 14 mm in diameter. Human chorionic gonadotrophin (hCG, Le Baode, Livzon) was administrated to imitate the LH surge when the diameter of dominant follicle reaching 18 mm or more. Embryo transfer was scheduled 5 days after ovulation. Thirty mg oral dydrogesterone (Duphaston, Abbott Biologicals B.V.) was administered daily from ovulation until the 12th week of pregnancy.

In the HRT group, patients were prescribed with 4 mg oral estradiol valerate (Progynova, Delpharm Lille) since day 2–4 of menstruation for 5–6 days, and then 6 mg for the following 5–6 days. Endometrium thickness was monitored after 10–12 days of medication by transvaginal ultrasound along with the serum levels of LH, estradiol (E2) and progesterone (P). Thereafter the dose of estradiol valerate, which was 8 mg/d maximally, was modulated according to the endometrium thickness and the E2 levels. When the endometrium thickness reached at least 7 mm, FET was scheduled in 5 days. Dydrogesterone 40 mg/d and progesterone capsules (Utrogestan, Capsugel) 200 mg/d was given as luteal phase support until the 12th week of pregnancy. Meanwhile, 6 mg/d to 8 mg/d of estradiol valerate was continued until clinical pregnancy, which was defined as the presence of an intrauterine gestational sac by ultrasonography at 7–8 weeks of gestation.

In the OI group, 75 IU/d of human menopausal gonadotropin (HMG, Le Baode, Livzon) was started on day 3–5. Dose of HMG was adjusted according to the development of follicles as monitored on ultrasonography and the measurement of serum sex steroids. Urinary hCG was administrated at dose of 6000 IU to 8000 IU when one or two follicles reached 18 mm or more in diameter.

One or two blastocysts were transferred. Maternal and neonatal complications including hypertensive disorders of pregnancy (HDP), gestational diabetes mellitus (GDM), placenta previa, oligohydramnios, preterm birth (PTB), low birth weight (LBW), small/large for gestational age (SGA/LGA) and gender of neonates were analyzed. HDP included gestational hypertension, pre-eclampsia, eclampsia and HELLP syndrome. GDM was diagnosed according to the 2013 WHO criteria (fasting plasma glucose ≥5.1 mmol/l; and/or 1 h plasma glucose ≥10.0 mmol/l; and/or 2 h plasma glucose ≥8.5 mmol/l after 24 weeks of gestation) [11]. Placenta praevia referred to a placenta that lay in close proximity to the internal cervical os or may partially or completely cover it after 28 weeks of gestation. Oligohydramnios was defined as the single deepest pocket (SDP) ≤ 2 cm or amniotic fluid index (AFI) ≤ 5 cm. PTB was defined as delivery before 37 gestational weeks while not earlier than 28 gestational weeks [12]. LBW referred to birth weight of full-term delivered newborns below 2500 g. SGA was defined as birth weight below the 10th percentile referential birth weight; LGA was defined as birth weight higher than the 90th percentile referential birth weight [13].

Statistical analysis

Continuous variables were summarized as the mean ± standard deviation and were compared by One-way ANOVA test. Chi-square test was used to compare the maternal and neonatal outcomes among the three groups. Multivariate logistic regression was performed to adjust for the effect of age, body mass index (BMI), irregular menstruation, the use of donor sperm, FET cycle number, number of transferred embryos, vanishing twin gestation, preconceptional fasting glucose (PFG), systolic pressure, diastolic pressure, endometrial thickness, antral follicle count (AFC), testosterone level, anti-Müllerian hormone (AMH) on HDP, PTB and LBW. Statistical significance level was set at 0.05. All statistical analyses were performed with SPSS (SPSS Inc., Version 21.0, Chicago, USA).

Results

The number of women receiving NC, HRT and OI protocol for FET were 4727, 1642 and 517, respectively. The baseline characteristics were listed in Table 1. BMI (23.2 ± 3.4 vs. 22.8 ± 3.3 vs. 22.5 ± 3.2 kg/m2, p < 0.001), AFC (15.6 ± 6.6 vs. 15.3 ± 6.0 vs. 14.9 ± 5.9, p < 0.001), and levels of testosterone (26.0 ± 11.9 vs. 25.6 ± 12.5 vs. 24.4 ± 11.7 ng/dL, p < 0.001) and AMH (5.3 ± 3.6 vs. 5.0 ± 3.5 vs. 4.7 ± 3.7 ng/mL, p < 0.001) were higher in HRT group compared to OI and NC group. As expected, HRT group and OI group had higher rates of irregular menstruation compared with NC group (21.9% vs. 21.7% vs. 5.6%, p < 0.001). Systolic pressure (120.8 ± 11.6 vs. 120.7 ± 11.9 vs. 119.5 ± 11.8, p < 0.001) and diastolic pressure (72.4 ± 8.6 vs. 73.3 ± 8.8 vs. 71.7 ± 8.7, p < 0.001) were higher in HRT and OI groups than NC group. And difference was also found in the FET cycle number among NC, HRT and OI groups (1.2 ± 0.5, 1.3 ± 0.6, 1.6 ± 0.8, p < 0.001). However, no difference was observed in the rate of donor sperm using (9.3% vs. 8.0% vs. 7.4%, p = 0.115) and vanishing twin gestation (3.0% vs. 3.2% vs. 2.5%, p = 0.710) among the three groups.

Table 1 The baseline characteristics of all participants
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Table 2 listed the maternal and neonatal outcomes. For the maternal outcomes, women using HRT protocol had higher rates of HDP (7.9% in HRT vs. 4.6% in OI vs. 3.5% in NC, p < 0.001) than women in OI and NC group. Significant difference was observed in the rates of GDM among the three groups (6.5% in HRT vs. 7.5% in OI vs. 5.2% in NC, p = 0.030). The subgroup analyses showed that the GDM rate in OI group was higher than that in NC group, however, no difference existed between HRT group and NC group. The rates of placenta previa (1.5% in HRT vs. 1.2% in OI vs. 1.0% in NC, respectively, p = 0.299) and oligohydramnios (1.0% in HRT vs. 1.7% in OI vs. 1.3% in NC, respectively, p = 0.437) were similar among the three groups. For the neonatal outcomes (Table 2), HRT and OI groups had higher risk of PTB compared to NC group (7.9% in HRT vs. 4.6% in NC, p < 0.001 and 7.7% in OI vs. 4.6% in NC, p = 0.001), but no significant difference was found between HRT and OI groups (7.9% vs. 7.7%, p = 0.773). The HRT group had increased risk of LBW compared with the NC group (4.5% vs. 2.8%, p = 0.001); however, no significant difference was observed between the OI group and the NC group (3.7% vs. 2.8%, p = 0.289). In addition, different LGA risk was found among three groups (26.2% in HRT vs. 22.1% in OI vs. 23.4% in NC, p = 0.040), although there was no significant difference between HRT and NC groups (p = 0.112). Additionally, the three groups were comparable in terms of SGA risk (2.9% in HRT vs. 5.0% in OI vs. 3.5% in NC, p = 0.073) and gender of neonates (p = 0.890).

Table 2 Maternal and neonatal outcomes after FET in women with NC, HRT and OI group
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After adjusting for the effect of age, BMI, irregular menstruation, AFC, endometrial thickness, the levels of testosterone, AMH, PFG, systolic and diastolic pressure et al. (Table 3, Fig. 2), HRT group still showed higher risk of HDP (aOR 2.00, 95% CI 1.54–2.60) and LBW (aOR 1.49, 95%CI 1.09–2.06) compared with the NC group. Risk of PTB in the HRT and OI groups were elevated compared with NC group (aOR 1.78, 95%CI 1.39–2.28 and aOR 1.51, 95%CI 1.02–2.23, respectively).

Table 3 Univariate and multivariate logistic regression model about NC, HRT and OI protocols
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Fig. 2
figure 2

Comparison of HDP, PTB and LBW between groups. Adjusted odds ratio (aOR) of hypertensive disorders of pregnancy (HDP), preterm birth (PTB), and low birth weight (LBW) compared women with natural cycles (NC) group. a aOR in women with hormone replacement therapy (HRT) group compared with NC group. b aOR in women with ovulation induction (OI) group compared with NC group

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The comparisons between IVF and ICSI cycles were listed in Additional file 2: Table S2-S13.

Discussion

In this study, we compared the maternal and neonatal outcomes of singletons born after FET with different endometrial preparation protocols in a large cohort. A higher risk of HDP and LBW was observed in the HRT group, as well as increased risks of PTB in both HRT and OI group compared with NC group. The differences in the maternal and neonatal outcomes could be explained by the excessive estrogen exposal, absence of corpus luteum (CL) and distinct clinical characteristics of population in the HRT group.

During early pregnancy, the uterine spiral arteries transform from high-resistance, low-capacity to low-resistance, high-capacity vessels by trophoblasts immigrating, invading and replacing the endothelial and smooth muscle wall of the spiral arteries [14, 15]. The remodeling of the uterine spiral arteries is crucial for sufficient nutrient and oxygen supply from the placenta to the fetus through an optimal uteroplacental blood flow. Excessive estrogen levels have been reported to impair the invasion of trophoblastic vessels during pregnancy. In pregnant baboon, it has been shown that estrogen plays a major role in regulating morphological and functional differentiation of the villous trophoblasts and signals between the placenta and fetus. Moreover, an elevated estrogen level markedly suppressed the vascular invasion [16,17,18]. Attenuation of trophoblast vascular invasion and spiral artery restructure will result in placental defect, which subsequently interferes the pregnancy process and end up with complications such as hypertensive and growth disorders [19,20,21,22,23].

It has been evidenced that high levels of estrogen could increase the risks of maternal and neonatal outcome during IVF-ET treatment. Imudia et al. discovered that an elevated serum E2 concentration during controlled ovarian hyperstimulation (COH) was associated with higher risk of maternal preeclampsia and SGA newborns for fresh embryo transfer [24]. Pereira N et al. conducted a retrospective cohort study of 4071 patients undergoing fresh IVF-ET cycles, indicating that serum E2 levels exceeding 2500 pg/ml during COH seemed to be an independent predictor for LBW in full-term singletons [25]. Additionally, compared to FET, fresh embryo transferred showed worse obstetrical outcome, including LBW and PTB, which was also attributed to a hyperestrogenic milieu generated during ovarian stimulation [26,27,28,29].

During the preparation with HRT protocol, the patients were prescribed estrogen normally from 2 weeks before embryo transfer till 8 th -10th week of pregnancy. It is assumed that the intake of exogenous estrogens during the period of trophoblastic vessels invasion may result in increased risk of maternal and neonatal complications, such as HDP and LBW. Study from Tatsumi et al. compared the pregnancy and neonatal outcomes among OI with letrozole cycle, natural cycle and HRT cycle for FET and discovered differences in terms of gestational weeks at delivery, birth weight and SGA/LGA among three groups [30].

Another explanation for high risk of HDP in HRT protocol could be ascribed to the absence of corpus luteum (CL) in the first trimester when CL contributed most to hormone secretion. According to a recent study by von Versen-Höynck F, CL defect was associated with elevated rate of preeclampsia, which was probably caused by lack of circulating relaxin, a potent vasodilator secreted by CL yet not supplemented in the luteal phase support [31]. Another study also stressed that the vascular health was impaired when no CL was present during early pregnancy, which suggested an insufficient vascular adaption involved in the development of preeclampsia [32]. Ginström Ernstad E et al. conducted a population-based retrospective study in Sweden, in which FET cycles were grouped according to presence or absence of a CL [33]. His results demonstrated an increased risk of hypertensive disorders in HRT FET cycles, which was in accordance with our findings.

Thirdly, the increased risk of obstetric and neonatal complications in the HRT group was also caused by the distinct characteristics of the population. In our study, the preferred choice for endometrium preparation was NC protocol; while for patients with irregular menstruation or history of oligo-ovulation or anovulation, HRT or OI will be suggested. Although patients with PCOS had been excluded in the study, it was till reasonable to expect more women with endocrine disturbance in HRT and OI group than NC group. Not unexpectedly, compared to the NC group, women in HRT group had more AFC, higher BMI, and serum testosterone levels. Increased BMI and high levels of testosterone were involved in obstetrical complications through altered trophoblast invasion and placentation [34]. Obese patients were more likely to have dyslipidemia, which was associated with pregnancy complications and adverse pregnancy outcomes owing to vascular damage and endothelial dysfunction caused by oxidative stress from free radicals and lipid peroxides [34,35,36]. Hyperandrogenism and insulin resistance were also reported to alter endovascular trophoblast invasion and placentation [37,38,39]. Excess maternal androgens reduced placental weight and affected fetal growth in rats [40]. Therefore, the endocrine-metabolic disturbance in women using HRT protocol may also contributed to the adverse pregnancy outcomes.

Our sample size was large enough to detect the differences of maternal and neonatal complications in different groups as well as to adjust for the maternal characteristics. One of the limitations was the estradiol concentration during early pregnancy was unavailable thus the comparisons of estradiol level during pregnancy among different FET groups were lacking. Another problem was that since OI protocol was costlier and more time intensive for patient visiting compared to HRT protocol, patients in the OI group might tend to have a history of thin endometrium or cancelled cycles which could lead to different maternal characteristics in this group.

Conclusion

Hormone replacement therapy protocol for frozen embryo transfer of blastocysts may be associated with adverse maternal and neonatal outcomes, such as high risks of HDP, LBW and PTB. Our results provide reference for endometrial preparation during FET treatment. More attention should be paid to the potential harmful effects of excessive estrogen and corpus luteum defect on maternal and neonatal complications during pregnancy.

Availability of data and materials

The data sets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

FET:

Frozen embryo transfer

NC:

Natural cycle

HRT:

Hormone replacement therapy

OI:

Ovulation induction

LBRs:

Live birth rates

PFG:

Preconceptional fasting glucose

PCOS:

Polycystic ovary syndrome

HDP:

Hypertensive disorders of pregnancy

GDM:

Gestational diabetes mellitus

PTB:

Preterm birth

LBW:

Low birth weight

SGA:

Small for gestational age

LGA:

Large for gestational age

BMI:

Body mass index

PFG:

Preconceptional fasting glucose

AFC:

Antral follicle count

AMH:

Anti-Müllerian hormone

CL:

Corpus luteum

COH:

Controlled ovarian hyperstimulation

References

  1. Zeilmaker GH, Alberda AT, van Gent I, Rijkmans CMPM, Drogendijk AC. Two pregnancies following transfer of intact frozen-thawed embryos. Fertil Steril. 1984;42:293–6.

    Article  CAS  Google Scholar 

  2. Wong KM, Mastenbroek S, Repping S. Cryopreservation of human embryos and its contribution to in vitro fertilization success rates. Fertil Steril. 2014;102:19–26.

    Article  CAS  Google Scholar 

  3. Maheshwari A, Pandey S, Shetty A, Hamilton M, Bhattacharya S. Obstetric and perinatal outcomes in singleton pregnancies resulting from the transfer of frozen thawed versus fresh embryos generated through in vitro fertilization treatment: a systematic review and meta-analysis. Fertil Steril. 2012;98:368–77.

    Article  Google Scholar 

  4. Belva F, Henriet S, Van den Abbeel E, Camus M, Devroey P, Van der Elst J, et al. Neonatal outcome of 937 children born after transfer of cryopreserved embryos obtained by ICSI and IVF and comparison with outcome data of fresh ICSI and IVF cycles. Hum Reprod. 2008;23:2227–38.

    Article  CAS  Google Scholar 

  5. Palomba S, Homburg R, Santagni S, La Sala GB, Orvieto R. Risk of adverse pregnancy and perinatal outcomes after high technology infertility treatment: a comprehensive systematic review. Reprod Biol Endocr. 2016;14:76.

    Article  Google Scholar 

  6. Roque M, Lattes K, Serra S, Sola I, Geber S, Carreras R, et al. Fresh embryo transfer versus frozen embryo transfer in in vitro fertilization cycles: a systematic review and meta-analysis. Fertil Steril. 2013;99:156–62.

    Article  Google Scholar 

  7. Ghobara T, Gelbaya TA, Ayeleke RO. Cycle regimens for frozen-thawed embryo transfer. Cochrane Database Syst Rev. 2017;7:Cd003414.

    PubMed  Google Scholar 

  8. Glujovsky D, Pesce R, Fiszbajn G, Sueldo C, Hart RJ, Ciapponi A. Endometrial preparation for women undergoing embryo transfer with frozen embryos or embryos derived from donor oocytes. Cochrane Database Syst Rev. 2010;1:CD006359.

    Google Scholar 

  9. Groenewoud ER, Cohlen BJ, Al-Oraiby A, Brinkhuis EA, Broekmans FJ, de Bruin JP, et al. A randomized controlled, non-inferiority trial of modified natural versus artificial cycle for cryo-thawed embryo transfer. Hum Reprod. 2016;31:1483–92.

    Article  CAS  Google Scholar 

  10. Endocrinology Subgroup and Expert Panel, Chinese Society of Obstetrics and Gyneocology, Chinese Medical Association. Chinese guideline for diagnosis and management of polycystic ovary syndrome. Zhonghua Fu Chan Ke Za Zhi. 2018;53:2–6.

    Google Scholar 

  11. World Health Organization. Diagnostic criteria and classification of hyperglycaemia first detected in pregnancy. Diabetes Res Clin Pract. 2013;103:341–63.

    Google Scholar 

  12. National Collaborating Centre for Women’s and Children’s Health (UK). Preterm labour and birth. UK: National Institute for Health and Care Excellence; 2015.

    Google Scholar 

  13. Dai L, Deng C, Li Y, Zhu J, Mu Y, Deng Y, et al. Birth weight reference percentiles for Chinese. PLoS One. 2014;9:e104779.

    Article  Google Scholar 

  14. Pijnenborg R, Bland JM, Robertson WB, Brosens I. Uteroplacental arterial changes related to interstitial Trophoblast migration in early human pregnancy. Placenta. 1983;4:397–414.

    Article  CAS  Google Scholar 

  15. Pijnenborg R, Vercruysse L, Hanssens M. The uterine spiral arteries in human pregnancy: facts and controversies. Placenta. 2006;27:939–58.

    Article  CAS  Google Scholar 

  16. Albrecht ED, Bonagura TW, Burleigh DW, Enders AC, Aberdeen GW, Pepe GJ. Suppression of extravillous trophoblast invasion of uterine spiral arteries by estrogen during early baboon pregnancy. Placenta. 2006;27:483–90.

    Article  CAS  Google Scholar 

  17. Babischkin JS, Burleigh DW, Mayhew TM, Pepe GJ, Albrecht ED. Developmental regulation of morphological differentiation of placental villous trophoblast in the baboon. Placenta. 2001;22:276–83.

    Article  CAS  Google Scholar 

  18. Bonagura TW, Pepe GJ, Enders AC, Albrecht ED. Suppression of extravillous trophoblast vascular endothelial growth factor expression and uterine spiral artery invasion by estrogen during early baboon pregnancy. Endocrine. 2008;149:5078–87.

    Article  CAS  Google Scholar 

  19. Khong TY, De Wolf F, Robertson WB, Brosens I. Inadequate maternal vascular response to placentation in pregnancies complicated by preeclampsia and by small for-gestational-age infants. BJOG. 1986;93:1049–56.

    Article  CAS  Google Scholar 

  20. Labarrere CAAO. Inadequate maternal vascular response to placentation in pregnancies complicated by preeclampsia and by small for-gestational-age infants. BJOG. 1987;94:1113–6.

    Article  CAS  Google Scholar 

  21. Pljnenborg RAJ, Davey DA, Rees A, Tiltman A, Vercruysse L, Assche A. Placental bed spiral arteries in the hypertensive disorders of pregnancy. BJOG. 1991;98:648–55.

    Article  Google Scholar 

  22. Sheppard BL, Bonnar J. The ultrastructure of the arterial supply of the human placenta in pregnancy complicated by fetal growth retardation. BJOG. 1976;83:948–59.

    Article  CAS  Google Scholar 

  23. Brosens IA, Robertson WB, Dixon HG. The role of the spiral arteries in the pathogenesis of preeclampsia. Obste Gynecol Annu. 1972;1:177–91.

    CAS  Google Scholar 

  24. Imudia AN, Awonuga AO, Doyle JO, Kaimal AJ, Wright DL, Toth TL, et al. Peak serum estradiol level during controlled ovarian hyperstimulation is associated with increased risk of small for gestational age and preeclampsia in singleton pregnancies after in vitro fertilization. Fertil Steril. 2012;97:1374–9.

    Article  CAS  Google Scholar 

  25. Pereira N, Elias RT, Christos PJ, Petrini AC, Hancock K, Lekovich JP, et al. Supraphysiologic estradiol is an independent predictor of low birth weight in full-term singletons born after fresh embryo transfer. Hum Reprod. 2017;32:1410–7.

    Article  CAS  Google Scholar 

  26. Kalra SK, Ratcliffe SJ, Coutifaris C, Molinaro T, Barnhart KT. Ovarian stimulation and low birth weight in newborns conceived through in vitro fertilization. Obstet Gynecol. 2011;118:863–71.

    Article  Google Scholar 

  27. Pelkonen S, Koivunen R, Gissler M, Nuojua-Huttunen S, Suikkari AM, Hyden-Granskog C, et al. Perinatal outcome of children born after frozen and fresh embryo transfer: the Finnish cohort study 1995-2006. Hum Reprod. 2010;25:914–23.

    Article  CAS  Google Scholar 

  28. Pinborg A, Loft A, Aaris Henningsen AK, Rasmussen S, Andersen AN. Infant outcome of 957 singletons born after frozen embryo replacement: the Danish National Cohort Study 1995-2006. Fertil Steril. 2010;94:1320–7.

    Article  Google Scholar 

  29. Wennerholm UB, Henningsen AK, Romundstad LB, Bergh C, Pinborg A, Skjaerven R, et al. Perinatal outcomes of children born after frozen-thawed embryo transfer: a Nordic cohort study from the CoNARTaS group. Hum Reprod. 2013;28:2545–53.

    Article  Google Scholar 

  30. Tatsumi T, Jwa SC, Kuwahara A, Irahara M, Kubota T, Saito H. Pregnancy and neonatal outcomes following letrozole use in frozen-thawed single embryo transfer cycles. Hum Reprod. 2017;32:1244–8.

    Article  CAS  Google Scholar 

  31. von Versen-Höynck F, Schaub AM, Chi YY, Chiu KH, Liu J, Lingis M, et al. Increased preeclampsia risk and reduced aortic compliance with in vitro fertilization cycles in the absence of a Corpus Luteum. Hypertension. 2019;73:640–9.

    Article  Google Scholar 

  32. von Versen-Höynck F, Narasimhan P, Selamet Tierney ES, Martinez N, Conrad KP, Baker VL, et al. Absent or excessive Corpus Luteum number is associated with altered maternal vascular health in early pregnancy. Hypertension. 2019;73:680–90.

    Article  Google Scholar 

  33. Ginström Ernstad E, Wennerholm UB, Khatibi A, Petzold M, Bergh C. Neonatal and maternal outcome after frozen embryo transfer: Increased risks in programmed cycles. Am J Obstet Gynecol. 2019;221:126.e1–126.e18.

    Article  Google Scholar 

  34. Palomba S, de Wilde MA, Falbo A, Koster MP, La Sala GB, Fauser BC. Pregnancy complications in women with polycystic ovary syndrome. Hum Reprod Update. 2015;21:575–92.

    Article  Google Scholar 

  35. Jan MR, Nazli R, Shah J, Akhtar T. A study of lipoproteins in normal and pregnancy induced hypertensive women in tertiary care hospitals of the north west frontier province-Pakistan. Hypertens Pregnancy. 2012;31:292–9.

    Article  CAS  Google Scholar 

  36. Vrijkotte TG, Krukziener N, Hutten BA, Vollebregt KC, van Eijsden M, Twickler MB. Maternal lipid profile during early pregnancy and pregnancy complications and outcomes: the ABCD study. J Clin Endocr Metab. 2012;97:3917–25.

    Article  CAS  Google Scholar 

  37. Palomba S, Marotta R, Di Cello A, Russo T, Falbo A, Orio F, et al. Pervasive developmental disorders in children of hyperandrogenic women with polycystic ovary syndrome: a longitudinal case-control study. Clin Endocr. 2012;77:898–904.

    Article  CAS  Google Scholar 

  38. Palomba S, Russo T, Falbo A, Di Cello A, Amendola G, Mazza R, et al. Decidual endovascular trophoblast invasion in women with polycystic ovary syndrome: an experimental case-control study. J Clin Endocrinol Metab. 2012;97:2441–9.

    Article  CAS  Google Scholar 

  39. Palomba S, Russo T, Falbo A, Di Cello A, Tolino A, Tucci L, et al. Macroscopic and microscopic findings of the placenta in women with polycystic ovary syndrome. Hum Reprod. 2013;28:2838–47.

    Article  CAS  Google Scholar 

  40. Sun M, Maliqueo M, Benrick A, Johansson J, Shao R, Hou L, et al. Maternal androgen excess reduces placental and fetal weights, increases placental steroidogenesis, and leads to long-term health effects in their female offspring. Am J Physiol Endocrinol Metab. 2012;303:1373–8.

    Article  Google Scholar 

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Acknowledgements

The authors are grateful to physicians and coordinators who enrolled patients and collected data all women who participated in this study.

Funding

National Key Research & Developmental Program of China (2017YFC1001100), National Natural Science Foundation of China (81771541 and 81701404), Science Foundation for Distinguished Young Scholars of Shandong (JQ201720).

Author information

Author notes

  1. Liping Zong and Peihao Liu contributed equally to this work.

Authors and Affiliations

  1. Center for Reproductive Medicine, Shandong University, No.157 Jingliu Road, Jinan, China

    Liping Zong, Peihao Liu, Daimin Wei, Lingling Ding & Yingying Qin

  2. National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China

    Liping Zong, Peihao Liu, Daimin Wei, Lingling Ding & Yingying Qin

  3. The Key Laboratory of Reproductive Endocrinology (Shandong University) Ministry of Education, Jinan, China

    Liping Zong, Peihao Liu, Daimin Wei, Lingling Ding & Yingying Qin

  4. Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China

    Liguang Zhou

Authors
  1. Liping Zong
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  2. Peihao Liu
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  3. Liguang Zhou
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  4. Daimin Wei
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  5. Lingling Ding
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  6. Yingying Qin
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Contributions

LPZ, PHL, YYQ. contributed to the conception and design of the study. LLD, DMW, PHL were involved in acquisition of date collection. LPZ, PHL, LGZ analyzed data and drafted the manuscript. All authors revised the article and gave their final approval of the submitted version.

Corresponding author

Correspondence to Yingying Qin.

Ethics declarations

Ethics approval and consent to participate

This study was approved by the ethics committees of Reproductive Medical Center of Shandong University. Each patient has signed an informed consent on obtaining and analyzing their clinical data prior to the initiation of IVF/ICSI-ET treatment.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Supplementary information

Additional file 1: Table S1.

Indications for frozen embryo transfer

Additional file 2: Table S2-S13.

The comparisons between IVF and ICSI cycles in frozen embryo transfer.

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Zong, L., Liu, P., Zhou, L. et al. Increased risk of maternal and neonatal complications in hormone replacement therapy cycles in frozen embryo transfer. Reprod Biol Endocrinol 18, 36 (2020). https://doi.org/10.1186/s12958-020-00601-3

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  • DOI: https://doi.org/10.1186/s12958-020-00601-3

Keywords

Reproductive Biology and Endocrinology

ISSN: 1477-7827

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